Copying-press.



H. T. HALLOWELL.

COPYING PRESS.

uruomxon FILED 111 12.25, 11:04.

980,248. 4 Patented 1113,1911.

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' form of bed frame.

UNITED STATES IZTENT OFFICE.

HOWARD '1. HALLOWELL, 0F HALLOWELL, PENNSYLVANIA, ASSIGNOR TO STANDARDPRESSED STEEL COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

COPYING-PRESS.

Specification of Letters Patent.

Patented Jan. 3, 1911.

To all whom it may concern:

Be it known that I, HOWARD T. I'IALLO- WELL, a citizen of the UnitedStates, residing at Hallowell, Montgomery county, State of Pennsylvania,have invented a new and useful Improvement in Copying-Presses, of whichthe following is a specification.

My invention relates to copying presses in which an arch is supportedover a bed frame and a platen is guided between the legs of such arch,and in which such platen is moved up and down by means of a screw havingsuitable means for actuating it and threaded in a nut in the apex of thearch.

It has for its object the construction of such a press, the majority ofthe parts of which are formed from suitably punched and stamped orotherwise shaped sheet metal, whereby lightness of the structure iscombined with strength.

The invention consists in the shaping and forming of the several sheetmetal parts and in the means for securing such parts together to obtaina maximum of structural strength with a minimum of weight, and in astructurally simple and economical form.

Figure 1 represents a front elevation of my improved copying press. Fig.2 represents an end elevation of the same. Fig. 3 represents ahorizontal section on the line mo2, Fig. 1. Fig. 1 represents alongitudinal section of the bed frame. Fig. 5 represents a longitudinalsection of another Fig. 6 represents a fragmental section of the bedframe on the line y3 Fig. 4. Fig. 7 represents a transverse section ofthe yoke on the line 2-2, Fig. 1. Fig. 8 represents a fragmental detailview of the lower end of one leg of the arch and a portion of the bedframe, illustrating another form for connecting said parts, differentfrom that shown in the other figures. Fig. 9 represents a fragmentaldetail view of the same parts and viewed from a point at a right angleto the view point of Fig. 8.

Similar numerals of reference indicate corresponding parts in thefigures.

Referring to the drawings: The press has a bed frame 1, cut out andstamped or otherwise shaped out of sheet metal to have a flat and levelbed plate 2, and outwardly flaring sides 3, terminating in foot flanges4, with which the bed frame may rest upon a table or other flat surfaceand by which it may,

if desired, be secured to such support by screws, clamps or otherwise.

For the purpose of bracing and reinforcing the flat sheet metal bedplate, trusses 0r braces 5 are secured beneath the plate, and saidtrusses are cut out and stamped out of sheet metal to be U-shaped incross section with lateral flanges on their side edges to bear againstthe under side of the bed plate, as seen in Fig. 6, and are preferablyshaped to have their greatest depth or thickness at their middles,tapering toward their ends, as seen in Fig. 4:, being thus arched toobtain the greatest strength with the least amount of metal. In themodified form illustrated in Fig. 5, wooden bars 6, secured with theirends in the sides of the bed frame, are employed. An arch, 7, is formedfrom a strip or plate of sheet metal and is bent by stamping orotherwise shaped to be substantially Ushaped in cross-section with flatside-flanges at and about the apex, as seen in Fig. 7, of the drawings.The edges of the side-flanges are bent outward from about the pointswhere the upper portion of the arch curves and merges into thesubstantially vertical legs 8, so as to form lateral flanges whichincrease in width toward the lower ends of the legs, as seen in Figs. 1,2 and 3, to form foot-flanges, 10, secured to the ends of the bed-frameby bolts or rivets, 9. A platen 11 slides vertically between the legs ofthe arch and has lugs 18 upon the middles of its end edges, which lugsenga e and slide in the segmental or semi-- circu ar grooves formed bythe concave sides of the legs of the arch, serving to vertically guidethe movements of the platen and to prevent horizontal displacement ofthe same when actuated by the screws. A boss 13 is provided at thecenter of the platen to receive and held against vertical displacementthe lower end of a screw 14:, while permitting said screw to be revolvedby a hand wheel 16. or other suitable means. This screw is threadedthrough a nut or femalethreaded block 15, which is inserted and firmlyheld against revolving between the side flanges at the apex of the arch.The under side 19. of the platen is substantially level and the upperside of the platen is braced by outwardly tapering truss ribs 13,extending from the boss and radiating toward the four corners of theplaten. The platen is formed from sheet metal and the ribs are likewiseout and stamped or otherwise formed from sheet metal, either integralwith or separate from but secured to the platen.

In Fig. 9 is disclosed a modified form of' attachment for the legs ofthe arch to the base frame, the lower ends of the lateral flanges beingpartly cut or slitted and the free portions being laterally bent andsecured by bolts or rivets to the top of the bed plate.

It will thus be seen that substantially the entire press, with theexception of the screw, its nut and its hand wheel, is constructed fromstamped .or similarly shaped sheet metal, whereby a very light structureis obtained while great strength of construction is attained by thearched cross sectional shaping and flanging of parts subjected totransverse strains, and trussing or bracing .of parts subjected tostrains against their flat surfaces.

It will be noticed that the side-flanges of the arch are of the greatestwidth at or near the apex ofthe same, where the strain from the screw,acting upon the platen, is greatest in a vertically transversedirection, and that such flanges thereupon are bent outward at theiredges to form the laterally extending flanges of increasing width, .soas to form gradually increasing braces for the legs to strengthen themagainst the horizontally transverse strain from the turning of the screwby its hand-wheel in screwing down the platen. A minimum of metal and,consequently, of weight is thus attained in this structure, coupled witha maximum of strength where this is required.

Heret-otore, copying presses have generally beenconstructedfrom castmetal (iron or steel) with the arch and bed frame usually cast in .onepiece. Cast metal requires proportionately considerable thickness topossess the necessary strength under strain; This has resulted in suchpresses being excessively heavy. If any part of the integral arch andbed frame breaks, the entire integral structure is useless and makesscrap.

In my improved press, any part damaged or injured maybe renewed whilethe re scones niainder of the press structure is retained, and thetensile strength and elasticity of rolled and stamped or drawn sheetmetal are such that breaking of partsby blow or strain is well nighimpossible.

When wrought metal (iron or steel) has been employed in presses of thischaracter, such metal has been used only for columns, arches and braces,heavy in structure and without the simplicity, lightness and structuralstrength inherent to pressed, stamped or drawn sheet metal.

In my present construction from suitably shaped sheet metal, the threemain structural elements, the bed frame, arch and platen, areconstructed from said metal, whereby the structural and economicadvantages heretofore pointed out are attained.

I am fully aware that various articles and mechanical structures havebeen made from pressed, stamped or drawn sheet metal, and patented assuch, where corresponding articles or structures had previously beenmade from cast, drop-forged or otherwise wrought metal, and I make nobroad claim for the substitution of sheet metal for cast or wroughtmetal, but

\Vhat I particularly point out and claim as my invention is In a copyingpress, a bed frame consisting of an integral piece of sheet metal shapedto form a flat bedplate and downwardlyv bent and slightly flaring sidesand ends, and an arch formed from an integral piece of sheetmetalsubstantially U-shaped in cross-section and having flat and wideside-flanges at and near the apex and curved downward to formsubstantially vertical legs, said side-fianges being bent outward fromthe merging points of the arch and the legs to form laterally projectingbracing flanges of downwardly increasing width upon said legs andsecured at their wide lower ends to the ends of the bed frame.

HOIVARD T. HALLORYELL.

